Lichenes. — Pteridophyten. « 145 



Pyknokonidien. Cladonia chlorophaea Flk. und Cladonia gracüis var. 

 chordalis Flk. isoliren Fumarprotocetrarosllure, erstere ausserdem 

 in geringen Mengen eine neue Substanz, Chlorophaeasäure be- 

 nannt. Nur Squamatsäure war nachweisbar in Cladonia crispata 

 var. gracilescens Rabh., Cladonia squamosa var. midtibrachiata i. 

 psetidocrispata Sandst. und f. turfacea Rehm der letzteren. 



In Hypogyrnyiia farinacea Bitt. wurde neben At ran or säure 

 ebenfalls eine neue Substanz entdeckt; Verf. nennt sie Farinacin- 

 säure. Sie ist nach der chemischen Formel CogH^gOg gebaut, schmilzt 

 bei 200—203° und steht der Physodsäure nahe. 



Zahlbruckner (Wien). 



Tidestroni, Ivar, Elysimn Marianum. (Ferns and fern-allies. 

 p. 1—56, plates 1-7, Septembers, 1906; p. 57— 80 ,; plates 8 and 9, 

 December 1 , 1906. \2^. Printed and published by the author, 

 Washington, D. C.) 



A treatise on the Pteridophyta of Maryland, Virginia and 

 the District of Columbia, with keys to the genera and species, and 

 with Photographie illustrations of herbarium specimens of the species 

 treated. 



Two forms of Dryopteris crisfata (L.) Gray are distinguished as 

 a niariana Tidestrom and ß lancastriensis (Spreng.) Tidestrom. 



Atliyriiini pyciiocarpon (Spreng.) Tidestrom replaces Aspleniurn 

 angustifoliiirn Michaux, 1803, invalidated by Asplenium angustifolitan 

 Jacquin, 1786. Maxon. 



ünderwood, L. M., American Ferns. VII. (Bulletin of the Torrey 

 Botanical Club. XXXIII. December 1906 [February 7, 1907J. 

 p. 591—605. textfigures 1—16.) 



A. A revision of the American species of Stenochlaena , num- 

 bering 12, with illustrations and a key to the species. Three are 

 described as new: S. angiista Underw. , the type from Columbia 

 (H. H. Smith, n". 1051), S. JamaicejisisJJndevw., confined to Jamaica, 

 (type, Maxon, n^. 2566), 5. Maxoni Underw., from Costa Rica (type, 

 Maxon, n". 411). The following new combinations occur: S. erythrodes 

 (Kunze) Underw. {Acvostichiim eyytJirodes Kunze), 5'. Feudleri (D. C. 

 Eaton) Underw. {Loniariopsis Fendleri D. C. Eaton), 5. Prietiriana 

 (Fee) Underw. [L. Prieiivia^ia Fee), 5. rectirvata (Fee) Underw. {L. 

 recuvvata Fee), and 5. vestita (Fourn.) Underw. {L. vestita Fourn.). 

 Stenochlaena Pittieri (Christ) Diels is a synonym of the last. 5". Jatnai- 

 censiSj hitherto included in sorbifolia, is not to be confused with 

 the true sorbifolia which ranges through the lesser Antilles to 

 Porto Rico and Hispaniola. 



B. Notes on the Status of Poecilopteris crenata Presl. The type 

 of P. crenata is figured and compared with that of Gymnopteris 

 contaminoides Christ, and the specific differences noted. The Ame- 

 rican species of this group are held to be not congeneric with the 

 type of the old-world genus LeptocJiilns , {Acrostichum axillare Cav.) 

 and, if a coherent group, must bear the name Poicilopteris Esch- 

 weiler, "the oldest name applied to any species included within the 

 present generic limits." This group is to be dealt with in a later 

 paper. Maxon. 



Botan. Centralblatt. Band 105. 1907. 10 



